Question
Why do I receive an "out of memory" error when I resize a sparse matrix in a MEX-file in MATLAB? I wrote a MEX-file that handles sparse matrices correctly. When the DLL returns the output data to the MATLAB workspace, the matrix is correct. I use the FIND function on this output matrix and can read out columns and rows. However, if the matrix contains less non-zero values, I get an OUT OF MEMORY error.
Expert Answer
Kshitij Singh
PhD Expert
Answered Aug 13, 2026
The problem appears to occur when you incorrectly size the JC field of a sparse matrix. This field must be size N+1, where N is the length of the number of columns of the sparse matrix.
100% Run Guarantee
3-Hour Fast-Track Delivery
Need a Custom Version or Complete Simulation for This Problem?
Our 500+ PhD engineers build, debug, and optimize working MATLAB scripts and Simulink (.slx) models tailored to your exact assignment rubrics with zero plagiarism.
Tested on MATLAB R2024b / R2026a
Turnitin 0% Plagiarism Report
Free 7-Day Revisions Guarantee
Have a different question? Ask here
Related matlab Questions & Solutions
Browse All →
Explore similar technical troubleshooting questions and verified MATLAB solutions:
Ready-to-Run MATLAB & Simulink Projects
Browse All Projects →